Copying device

Abstract

Copying method comprises applying uniformly an auxiliarly heating treatmento the whole surface of a thermally developable photosensitive material containing organic salt at a temperature within a developing temperature range appropriate to the photosensitive material before image exposure, and heating for developing after exposure.

We claim: 
     
       1. A film reader printer which comprises an optical source means for irradiating a microfilm bearing an image, a projecting lens, a transparent support for holding a thermally developable copying sheet at an exposure position, a light transparent conductive member uniformly overlying one side of the transparent support on which a copying sheet is placed, the transparent support being a glass plate and the light transparent conductive member being made of tin oxide, electrodes connected to the light transparent conductive member capable of applying voltage to the light transparent conductive member, said conductive member generating heat by the flow of electric current to thereby heat the copying sheet, a screen for observing an image of the film projected by the projecting lens, a reflecting mirror movable on a light path of the projecting lens, and the reflecting mirror projecting a light image passing through the projecting lens to the screen. 
     
     
       2. A film reader printer which comprises an optical source means for irradiating a microfilm bearing an image, a projecting lens, a support for holding a thermally developable copying sheet at an exposure position, an electroconductive member made of tin oxide and overlying one side of the support on which a copying sheet is placed, means for applying voltage to the electroconductive member, said electroconductive member generating heat by the flow of electric current to thereby heat the copying sheet, a screen for observing an image of the film projected by the projecting lens, and means for selectively projecting a light image passing through the projecting lens to one of, the screen and the copying sheet. 
     
     
       3. A copying device for reproducing an image on a thermally developable photosensitive material which comprises a supporting member for holding the photosensitive material at an exposure position, an electric conductive material uniformly coated on a surface, opposite to that contacting the photosensitive material, of the supporting member, a means for applying voltage to the electroconductive material so as to heat the electroconductive material, said means being connected with the electroconductive material, said electroconductive material generating heat by the flow of electric current, and an optical means for projecting a light image of an original to be copied to the photosensitive material uniformly contacting the surface of the supporting member coated with the electroconductive material. 
     
     
       4. A copying device according to claim 3 in which the electroconductive material is made of tin oxide. 
     
     
       5. A copying device according to claim 3 in which the means for applying voltage works to apply voltage to the electroconductive material before and during the imagewise exposure.